LOCAL OPERATION
46882/439 3-7
12
AUXILIARY PORT 25
-pin socket. Can accept external data to modulate each of the
internal sources for 2
-level or 4-level FSK. For contact
allocation see ‘Auxiliary port connector’ in Chapter 2.
13
EXT I/P
50 Ω SMA connector. Enables a signal to be fed into the
combiner from an external signal generator.
14
INT O/P (optional)
50 Ω SMA connector. Used when a third source is fitted to
provide a rear-panel output. When linked to the EXT I/P
socket, connects the C source output to the combiner.
When this socket is not in use it must be terminated by the
attached 50 Ω load to prevent signal radiation from the C
source.
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